Stove



(No Model.)

r W. J. KEEP.

STOVE.

No. 528,945. Patented Nov. 13, I894.

[NYE/V1012 H IU J LLLL L I I WITNESSES UNITED STATES.

PATENT OEETEE.

, WILLIAM J. KEEP, OF DETROIT, MICHIGAN, ASSIGNOR TO THE MICHIGAN STOVECOMPANY, OF MICHIGAN.

STOVE.

SPECIFICATION forming part of Letters Patent No. 528,945, dated November13, 1894.

Application filed May 31, 1893. Serial No. @6045 (N model.)

To all whont it may concern:

Be it known that I, WILLIAM J. KEEP, a citizen of the United States,residing at Detroit, county of Wayne, State of Michigan, have in-.veuted a certain new and useful Improvement in Stoves; and I declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itpertains to make and use [0 the same, reference being had to theaccompanying drawings, which form a part of this specification.

This invention relates to stoves and has for its object an improvementin the means for I I5 opening and closing, and for holding in either itsopen or closed position the damper, orsmall auxiliary door, throughwhich the air necessary for combustion is admitted to the fire. Theopening for the ad mission of air, is usually made through the main doorthat opens into the space, below the fire pot or fire place, and thisopening is arranged to be closed, either by a small door turning onhinges or by a sliding door, sliding in ways. The latter method isobjectionable because it requires that both the ways and the doorsshouldbe straight, in order that the doors may slide in the ways withoutbinding, and if in the process of manufacture, either of the parts iswarped at all as is quite likely to happen, the door does not accuratelyfit the ways, and the opening is not perfectly closed.

I have shown my invention as applied to the base of a heating stove, inwhich there is a large ash pit having a door, adapted to swing onvertical hinges, and I have shown the small door or damper, as closingan opening through the upper part of this large door, the opening beingso located that it can be utilized, not only for the admission of airand the regulation of the draft, but also for the admission of a pokeror shaker; but the auxiliary door and its opening and closing devicesmay be attached to any other form of 45 stove base, than that shown inthe drawings.

In the drawings, Figure 1, shows a round stove base, with my damperattached to the door opening into it, the damper being in a closedposition. Fig. 2, shows the same com- 50 bination with the damper in anopen position. Fig. 3, shows in elevation the cam by which the damper isopened and locked open,

or closed and locked closed. Fig. 4, shows an end view of the bearingswhich secure the damper to its frame. Fig. 5, is a cross sec-' tion atthe line a: as of Fig. 1. Fig. 6 is a detail view of a portion of thedamper door and cam.

A, indicates a stove base; 13, a large door closing an opening into thesame.

0, indicates an opening through the door B, and D, indicates the damperor door, closing the opening 0.

I prefer to make the door D, concave or shell shaped, with its concaveside toward the door B. The concave shape of the door D, gives itgreater strength, and rigidity than it would have if it were made fiat,and enables me to secure a more nearly air tight connection between thedoor and its frame.

Around the edge of the opening 0, is a raised flange c, behind which isa depression orvalley c, and around the edge of the door D, is a flanged. WVhen the door closes the flange (1, drops into the valley ordepression 0, and the engagement between the two parts brings the doorto its proper closing position and corrects any tendency of the door D,to move axially in its bearing or loosely in them.

The hinge of the door is formed bya hinge 8o rod R,R',which I prefer tocastintegralwith the door D, one branch R, extending to the right, andthe branch R, extending to the left. The door is held in place by lugsZ, Z, and clips 70, k. The lugs Z, Z, are cast with the main door B. Theclips It, 7c, are held to the main door by rivets or bolts. A lug H,also cast to the main door B, engages the left end of the pintle R, andprevents the door D, from moving to the left.

To the right of the opening 0, is a cam K, rotating on a central holdingpin P. The under side of the cam K, is fitted to the contour of the partof the stove door B, with which it engages and may be either fiat orconical, preferably flat. The upper side is provided with a cam track25, rising somewhat like the section of a thread of' a screw for about aquarter of the circumference of the entire piece. Underneath the campart 25, the piece 10c K, is concave or cut away, as indicated in Fig.3at e and in dotted lines at Fig. 6. The

upper end of the track 15, terminates in a holding face 6, and thisholding face 6, is substantially at right angles to the radius of thepiece K. It is slightly indented, the axis of the notch being parallelwith the axis of the pin P. The cam K below the part e has a cutawayportion e which registers with the inclined under face of the track asindicated in Figs. 1 and 6.

g is a spur extending laterally from the damper D over which the cam isadapted to hear when the damper is closed as hereinafter described. 1

The cam K, is provided with a handle H, or with other suitable means bywhich it may be turned on its pin P. v

The right hand end R,-of the damper pintle, is curved and the curvedpart 8, when the damper D, is closed extends over the outer surface ofthe cam K, as shown in Fig. 1. When the cam K, is turned on its pin thecurved end 3, of the pintle R, rides on the cam surface t, and thedamper D, is thrown open. The curved end 8, continues to rise or turn onthe axis of the pintle R, until it becomes parallel with the axis of thepin P, at which time it has been lifted off from the cam track t, andengages with the indented holding face e. The spring or weight of themetal is sufficient to hold the pintle in close engagement with the cam,and lock the damperopen against accidental closing.

To close the door the cam K is moved back forcing the portion 8 from theholding face,

the portion 3 riding down the track t while the spur g enters theopening 6 in the cam K, shown in Fig. 6, while the continued movement ofthe cam K carries its upper face over the outer face of the spur andlocks the door in position. It is to be understood that the spur has auniform upward movement with the parts by virtue of the inclined upperface 8 of the track as shown in Figs. 1, 3 and 6.

The concave or shell form of the damper causes a perfect contact to bemade around the entire edge.

What I claim is 1. In astove, the combination of a damper, a crankterminated pintle, a rotating cam having an inclined track and a groovedholding face, the groove having its axis parallel to the axis ofrotation of the cam and being adapted to engage with the arm of thecrank, substantially as specified.

2. In a stove the combination of a damper provided with a projection anda locking spur, a cam provided with a track the upper side of which isadapted to engage with the projection and throw the door open, the underside of which is adapted to engage with the spur and lock the door shut,substantially as described.

In testimony whereof I sign this specification in the presence of twowitnesses.

WILLIAM J KEEP.

Witnesses:

S. E. WIDDIFIELD, ISAAC S. FILER.

